NTP Configuration Examples 963
Clock precision: 2^7
Clock offset: -21.1982 ms
Root delay: 15.00 ms
Root dispersion: 775.15 ms
Peer dispersion: 34.29 ms
Reference time: 15:22:47.083 UTC Apr 20 2007 (C6D95647.153F7CED)
As shown above, Switch B has been synchronized to Switch C, and the clock
stratum level of Switch B is 2, while that of Switch C is 1.
# View the NTP session information of Switch B, which shows that an association
has been set up between Switch B and Switch C.
[SwitchB] display ntp-service sessions
source reference stra reach poll now offset delay disper
**************************************************************************
[245] 3.0.1.31 127.127.1.0 2 15 64 24 10535.0 19.6 14.5
[1234] 3.0.1.33 LOCL 1 14 64 27 -77.0 16.0 14.8
note: 1 source(master),2 source(peer),3 selected,4 candidate,5 configured
Total associations : 2
Configuring NTP
Broadcast Mode
Network requirements
■ Switch C’s local clock is to be used as a reference source, with the stratum level
of 2.
■ Switch C works in the broadcast server mode and sends out broadcast
messages from VLAN-interface 2.
■ Switch D and Switch A work in the broadcast client mode and listen to
broadcast messages through their respective VLAN-interface 2.
Network diagram
Figure 285 Network diagram for NTP broadcast mode configuration
Configuration procedure
1 Configuration on Switch C:
# Specify the local clock as the reference source, with the stratum level of 2.
<SwitchC> system-view
[SwitchC] ntp-service refclock-master 2
Vlan-int3
1.0.1.11/24
Vlan-int3
1.0.1.10/24
Vlan-int2
3.0.1.31/24
Vlan-int2
3.0.1.32/24
Vlan-int2
3.0.1.30/24
Switch A Switch B
Switch C
Switch D
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